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CMB-203-11D3N-W-H Equivalent & Substitute Parts
Part Overview
The CMB-203-11D3N-W-H is a thermal circuit breaker manufactured by Carling Technologies, rated for 20A at 250V AC and 32V DC. This single-pole, panel-mount device features push-to-reset actuation and holds Active product status with full compliance to CE, cUL, TUV, UL1077, and UL1500 standards. The part is RoHS3 compliant and REACH unaffected. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design flexibility permits equivalent component selection.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | CMB-203-11D3N-W-H |
| Manufacturer | Carling Technologies |
| Series | CMB |
| Breaker Type | Thermal |
| Current Rating | 20A |
| Voltage Rating - AC | 250V |
| Voltage Rating - DC | 32V |
| Mounting Type | Panel Mount |
| Actuator Type | Push to Reset |
| Number of Poles | 1 |
| Illumination | None |
| Product Status | Active |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the CMB-203-11D3N-W-H is determined by strict equivalence across the following critical parameters:
Primary Substitution Criteria:
- Current Rating: 20A (exact match required)
- Voltage Rating - AC: 250V (exact match required)
- Breaker Type: Thermal (exact match required)
- Mounting Type: Panel Mount (exact match required)
- Actuator Type: Push to Reset (exact match required)
- Number of Poles: 1 (exact match required)
Secondary Consideration:
- Voltage Rating - DC: The main part specifies 32V DC. Substitute parts rated at 50V DC provide enhanced capability and are functionally compatible in applications requiring 32V DC operation.
All identified substitute parts are manufactured by OptiFuse under the CBW57 series. Each substitute maintains Active product status, RoHS3 compliance, and equivalent approval agency certifications (cURus, UL 1077, UL 1500). The substitutes differ only in connector or terminal configurations, which are denoted by suffix variations in the part number (EJ, EL4, ES, HS, PB, PF, PL designations).
Parameter Comparison
| Parameter | CMB-203-11D3N-W-H | CBW57-EJ-20A | CBW57-EL4-20A | CBW57-ES-20A | CBW57-ES-20A-5H | CBW57-ES-20A-5X | CBW57-HS-20A-5X | CBW57-HS-20A-C | CBW57-PB-20A-WX | CBW57-PF-20A-5X | CBW57-PL-20A-5X |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Carling Technologies | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse | OptiFuse |
| Breaker Type | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal | Thermal |
| Current Rating (Amps) | 20A | 20A | 20A | 20A | 20A | 20A | 20A | 20A | 20A | 20A | 20A |
| Voltage Rating - AC | 250V | 250V | 250V | 250V | 250V | 250V | 250V | 250V | 250V | 250V | 250V |
| Voltage Rating - DC | 32V | 50V | 50V | 50V | 50V | 50V | 50V | 50V | 50V | 50V | 50V |
| Mounting Type | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount | Panel Mount |
| Actuator Type | Push to Reset | Push to Reset | Push to Reset | Push to Reset | Push to Reset | Push to Reset | Push to Reset | Push to Reset | Push to Reset | Push to Reset | Push to Reset |
| Number of Poles | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Illumination | None | None | None | None | None | None | None | None | None | None | None |
| Product Status | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
All listed substitute parts maintain Active product status and full RoHS3 compliance, ensuring regulatory alignment with the original CMB-203-11D3N-W-H. The OptiFuse CBW57 series substitutes carry equivalent safety certifications including cURus, UL 1077, and UL 1500 standards, meeting or exceeding the approval requirements of the primary part.
The primary distinction among substitute options lies in terminal and connector configurations, identified by part number suffixes. Selection between CBW57-EJ-20A, CBW57-EL4-20A, CBW57-ES-20A, CBW57-ES-20A-5H, CBW57-ES-20A-5X, CBW57-HS-20A-5X, CBW57-HS-20A-C, CBW57-PB-20A-WX, CBW57-PF-20A-5X, and CBW57-PL-20A-5X depends on mechanical interface requirements specific to the application circuit board or panel design.
All substitute parts are rated at 50V DC, providing enhanced DC voltage capability compared to the 32V DC rating of the original part. This higher DC rating does not affect compatibility in applications operating at or below 32V DC.
Frequently Asked Questions (FAQ)
Q: Can OptiFuse CBW57 series parts directly replace the Carling Technologies CMB-203-11D3N-W-H?
A: Yes. All listed OptiFuse CBW57 substitutes match the critical electrical parameters: 20A current rating, 250V AC voltage rating, thermal breaker type, single-pole configuration, push-to-reset actuation, and panel-mount design. Compatibility depends on terminal configuration alignment with the circuit board or panel interface.
Q: What is the significance of the higher 50V DC rating on substitute parts?
A: The OptiFuse CBW57 series is rated at 50V DC compared to the 32V DC rating of the CMB-203-11D3N-W-H. This represents enhanced DC voltage capability. In applications operating at 32V DC or lower, the higher rating provides additional safety margin and is fully compatible.
Q: How do I select the correct CBW57 variant?
A: Selection is determined by terminal or connector type required by your specific application. The suffix designations (EJ, EL4, ES, HS, PB, PF, PL) indicate different mechanical interfaces. Consult your circuit board or panel specifications to identify the required terminal configuration.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed OptiFuse CBW57 substitutes are RoHS3 compliant and REACH unaffected, matching the environmental compliance status of the original CMB-203-11D3N-W-H.
Q: What certifications do the substitute parts carry?
A: OptiFuse CBW57 series parts carry cURus, IP 40, SAE J1171, UL 1077, and UL 1500 certifications. These certifications meet or exceed the CE, cUL, TUV, UL1077, and UL1500 standards of the original part.
Q: Are there inventory considerations when selecting a substitute?
A: Inventory levels vary across the CBW57 variants. Current stock availability ranges from 850 to 2458 pieces across the listed substitutes, compared to 839 pieces for the original CMB-203-11D3N-W-H. Verify current inventory status for your selected variant.
Q: Can I use these substitutes in new designs or only as replacements?
A: These substitutes are suitable for both new design implementations and direct replacement scenarios, provided the terminal configuration matches your mechanical interface requirements.
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